Hadith 3:631

Narrated Sahl bin Sad As-Sa'idi:

A drink (milk mixed with water) was brought to Allah's Apostle who
drank some of it. A boy was sitting to his right, and some old men to
his left. Allah's Apostle said to the boy, "Do you allow me to give
the rest of the drink to these people?" The boy said, "O Allah's
Apostle! I will not give preference to anyone over me to drink the
rest of it from which you have drunk." Allah's Apostle then handed the
bowl (of drink) to the boy. (See Hadith No. 541).